Appearing in the Daedric weapon set, this weapon has appeared in Elder Scrolls games since Morrowind. The Daedric Warhammer has the highest base damage out of all unenchanted weapons in the base game. However, The Elder Scrolls V: Dawnguard introduces the Dragonbone Warhammer, which has a base damage of 28, raising the bar.
The warhammer is improved at grindstones by using Ebony Ingots. At levels 46 and 47, unenchanted and enchanted variations of this weapon start surfacing as random loot, respectively. Armor vendors also start selling it as this level. In addition to random drops, this weapon can be smithed if the Dragonborn has the necessary perks. [Source: wikia]
You can download the papercraft model here: The Elder Scrolls V: Skyrim - Daedric Warhammer Free Papercraft Download